Don't pierce any part of your body while in the middle of looking for eyeliner because it "seems like a good idea".
Definitely do not pierce yourself if you know damn well that you do not have parental permission. It does not matter how long you have been saying that you were going to do it. It does not matter that you have been asking for seven years. It does not matter that it is your body.
And no matter what, don't brandish said piercing to said parental figures and start laughing really, really hard.
Also, don't do all of this three days before a friend is having a show that you really want to go to.
Did I mention that I'm grounded?